Fig. 1

Distribution of sample trees by relative density class (a), diameter class (b), and site index class (c). Relative density classes were (1) <0.20, (2) ≥0.20 and <0.30, (3) ≥0.30 and <0.40, (4) ≥0.40 and <0.50, (5) ≥0.50 and <0.60, and (6) ≥0.60. Site index classes were (1) ≥18.0 and <20.0, (2) ≥20.0 and <22.0, (3) ≥22.0 and <24.0, (4) ≥24.0 and <26.0, (5) ≥26.0 and <28.0, and (6) ≥28.0 and <30.0